Thanks for all the replies!
The decking on the top is radiant barrier with 3/4 plywood on top of that. The top deck will be used for storage.
The interior temperature of the barn will probably be in the 90-100 degf range during the many hot summer months. I don't know for sure yet. I had roof vent included in the barn construction which will definitely help. We'll see.
I will be installing a heat pump. With the 1/2 inch sheathing on the outside walls (and also on the walls facing the barn metal)and the R15 insulation, I'm hoping I will have pretty good sound proofing. I will also be installing some type of acoustics in the room. Of course, I will be doing this in stages as everything is expensive. I will be doing the electric and insulation this week.


Todd